Improvement in locomotive-boilers



UNITED STATES PATENT` OFFICE..

JOHN BRIGGS, OF LOUISVILLE, KENTUCKY.

IMPROVEMENT IN LOCOMOTIVE-BOILERS.

speeirnation forming part of Leiters Patent No. rcsadated october 27, 1863.

To all whom it may concern:

Be it known that I,JOHN BRIGGs, of Louisville, in the county of Jefferson and -State of Kentucky, have invented certain new and useful Improvements in Locomotives; and I do hereby declare the following to be a full and exact description of the same, reference be ing had to the accompanying drawings, making part of this specification, in which- Figure l is a vertical longitudinal section at a: a', Fig. 4, of the upper part of a locomotive, illustrating my invention. Fig. 2 is a front elevation of the same. Fig. 3 is a-vertical transverse section of the same at y y, Figs. l and 4. Fig. 4 isa top view. Fig. 5 is an elevation, partly in section, of the hollow staybolts hereinafter described, illustrating the mode of securing it in the boiler-plates. Fig. 6 is a front elevation of a fragment of the boiler-plates, showing an end view of the hollow bolt.

Similar letters of reference indicate corresponding parts in the several views.

Ihe present invention consists, first, in a peculiar construction of locomotive-boiler, permitting the entire occupation ofthe barrel with water-space and liuc-tubes, and dispensing with the horizontal crown-sheet; second, in the use of hollow stay-boltsv constructed and applied, as hereinafter described, to strengthen the shell and admit air to the furnace.

In order to enable others skilled in the art to which my invention appertains to fully understand and use the same, I will proceed to describe its construction and operation.

A represents the cylindrical shell or barrel7 of the boiler, traversed by longitudinal flue-tubes B B, placed equidistantly throughout its entire area. C is a drum placed above the barrel A and communicating therewith, either directly or through legs c c, as in the present illustration. If legs be used, they must be of sufficient size to permit a free circulation of water. D is the iire-box. E is a smoke-chamber, and F the stack. Vithin the stack F are a number of vertical pipes, G G G2, open at both ends and placed concentrically, one above and on the outside of the other. The lower pipe, G, may be attached to the top of the smoke-chamber E, and project upward some distance within the stack.

The upper tubes, G G2, may be attached to the shell of the stack by brackets g g.

H represents a sliding gate, which may be opened to permit the removal of soot and cinders, which collect in the space around the pip@ G I I are Scrapers attached to a ring or circular shaft, J, surrounding the pipe G, for the purpose of expelling such accumulations through the gate H. K is a door giving access to the interior of the smoke-chamber.

L represents the firing-door.

M M are hollow stay-bolts employed to strengthen the straight portions of the shell in front of the fire-box, and serving also to admit a free and strong current of air to the re as the locomotive moves forward.

N is a register pierced with apertures corresponding in size and position with the hol low bolts M. By a suitable adjustment of said register the apertures in the bolts may be entirely closed or opened to any extent desired, and by this the draft to the fire regulated as required.

An enlarged view of one of the hollow bolts, in connection with the plates, is given in Fig. 5, from which the manner in which they are inserted will be clearly understood. A screwthread is cut on the outside of the hollow bolt and corresponding threads in the aperturesinA the plates. The hollow bolt is then screwed completely through one plate and into the other, and is riveted or clinched at both ends.

O O are try-cocks.

In using the above-described boiler, it is supplied with sufcient water to completely fill the the barrel A and legs c and the lower part of the drum O. The Hue-tubes B are at all times completely covered with water, and being extended throughout the whole diameter of the barrel their size or number may be correspondingly increased. In practice I prefer to extend the usual number, or even a smaller number, of tubes over the entire area of the drum, so as to be enabled to use tubes of much larger size.

By constructing a steam-boiler in the manner above described I entirely avoid the necessity for a horizontal crown-sheet or other horizontal surface exposed to pressure. I likewise provide greater room for flue-tubes and a great increase of water-space with the 2 lasso smallest possible expenditure of material. The formof the boiler is also such as to afford the greatest possible strength in proportion to its capacity.

The products of combustion rise through the lower and smallest pipe, G, with a forcible draft, but immediately on passing outof the said pipe the ascent of the outer part of the column is retarded by the increased diameter of the flue, the effect of which is that cinders and other heavy matter falling over to the outside are precipitated around the pipe Gout of rea-ch of the draft. A like effect occurs as the products of combustion pass above the top of the successive pipes G G2, the lower end of each pipe projecting to a sufficient distance below the top of the pipe within it to eiit'ectually prevent any upward draft on the outside of thesetubes.

vantage than many now in use.

I am aware that Letters Patent were granted on the 5th day of December, 1842, to A. W.

Sharp and W. F. Horton for a steam-boiler in which the cylinder is partially filled with Wafer tubes and surmounted by a Water and steam drum. This I do not claim. My invention relates to-boilersin which the products of combustion pass through the tubes within the cylinder.

Having thus described my invention, what I claim as new therein,and desire to secure by Letters Patent, is

1. 'Ihe combination, with a tubular-fined boiler, of the water and steam'drum C, placed directly over the tube-cylinder, in the manner and for the purposes set forth.

2. The hollow stay'bolts lVI M, adapted and employed in the manner herein described, to serve the combined purposes of strengthening the straight parts ofthe shell and admitting a draft of air from the front to the re, when used in combination with the register N, and all arranged in the Vmanner herein described.

` JOHN BRIGGS.

Vitnesses:

OorAvrUs KNIGHT, J AMES H. BRADLEY. 

